Sinn U1 SDR – pre owned

Used but mint condition Sinn U1 SDR with box and papers dating to April 2015 with the balance of the 2 year warranty remaining, Comes complete with all boxes, papers and bracelet links. The U1 SDR is a variation of the standard U1, modified at Sinn to incorporate a black tegimented steel rotating bezel. Other than the black bezel, it is the same as the regular U1. Sinn are well renowned and highly regarded in watch manufacturing as they are innovators and producers of mainly instrument, military and aviation watches. They are know for investing large amounts of money in research and development and have some world leading technical innovations that make their watches highly desirable and collectible. Moreover, they are fanatical about engineering standards , and the Sinn watches are over engineered, without being over designed – and at a price point that does not edge them away from the enthusiasts. The U1 and U2 watches are indeed unique and one of a kind. They keep in line with Sinn’s philosophy of manufacturing watches that are built to the highest standards, and employ the latest in technical developments. The U1 and U2 are designed with specific diving use and totally impervious to water penetration. The U1 and U2 cases are made from stainless steel that used in the construction of the outer hull of submarines. The steel was by procured by Sinn from a steel supplier to Emden GmbH, one of Germany’s North Sea shipbuilding yards who construct submarines from the very same steel. This submarine steel is not only extraordinarily sea water resistant (PRE value up to 38), it possesses also the highest anti magnetic quality. The Uni directional ratchet operated rotating bezel is Tegimented where the steel can be hardened on up to 1500 Vickers. Compared to regular 316 L stainless steel which is hardened to approximately 220 Vickers. The indices are machined directly into the bezel without the use of bezel inserts, which can corrode or come loose at deep depths. The watch has the bezel hardened to 1,500 Vickers by the use of Sinn’s tegimented treatment in the Sinn laboratory. Has a sapphire crystal with anti reflective coating, screw down crown with three gaskets and is water resistant to 1000 metres to DIN 8306 specification. The watch has a Seletta SW200 automatic movement, operating at 28,800 beats per hour, shockproof according to DIN 8308 specification and anti magnetic according to DIN 8309 specification. It operates in temperatures between -45° Celsius to +80° Celsius due to the special lubricants in the movement applied in the Sinn laboratory. Super Luminova luminous broad hands and dial markings for maximum legibility. Functional and utility looking red and white hands and sweep second hand. Comes silicone strap with double push button deployant buckle and fliplock safety clasp. Outstanding watch. Width is 44mm, lug to lug is 50 mm, Thickness is 14.5mm.